riscy-business

Article: RISC-Y Business: Raging against the reduced machine.

Prerequisites

• Visual Studio 2022 with the C++ Clang Compiler for Windows (16.0.5) component
• CMake 3.26 (earlier may work, but not recommended)

riscvm

This folder contains the VM host (rv64i interpreter).

To build:

cd riscvm
cmake -B build -T ClangCL
cmake --build build --config RelWithDebInfo

transpiler

This folder contains the project responsible for changing making the LLVM Bitcode (.bc) files compatible for compilation with the riscv64 target. This tool is the magic that allows us to build a regular Windows project with clang-cl and then convert that into a payload compatible with the riscvm host.

To build:

cd transpiler
cmake -B build -DCMAKE_PREFIX_PATH=c:/llvm-install
cmake --build build --config RelWithDebInfo

The llvm-install is a regular LLVM installation. This should match the version of Clang used by Visual Studio (sometimes it can be later). You can use a precompiled llvm-17.0.2-win64.7z if you want to save some time building LLVM.

payload

This folder contains an example payload project.

To build:

cd payload
cmake -B build -T ClangCL
cmake --build build --config Release

This should give you a payload.bin that can be passed as an argument to riscvm to execute.